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M38827F8-XXXHP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M38827F8-XXXHP Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 62 page Rev.1.01 Nov 14, 2005 page 11 of 60 REJ03B0089-0101 3882 Group MEMORY RAM RAM is used for data storage and for stack area of subroutine calls and interrupts. ROM ROM is used for program code and data table storage. The first 128 bytes and the last 2 bytes of ROM are reserved for device testing code and the rest is user area. Zero Page Access to this area with only 2 bytes is possible in the zero page addressing mode. Special Page Access to this area with only 2 bytes is possible in the special page addressing mode. Interrupt Vector Area The interrupt vector area contains reset and interrupt vectors. Special Function Register (SFR) Area The special function register area contains the control registers such as I/O ports, timers, serial I/O, etc. ROM Code Protect Address “0016 ” is written into ROM code protect address (other than the user ROM area) when selecting the protect bit write by using a se- rial programmer or selecting protect enabled for writing shipment by Renesas Technology corp..When “0016 ” is set to the ROM code protect address,the protect function is enabled,so that read- ing or writing from/to QzROM is disabled by a serial programmer. As for the QzROM product in blank, the ROM code is protected by selecting the protect bit write at ROM writing with a serial pro- grammer. As for the QzROM product shipped after writing,“0016 ” (protect enabled) or “FF16 ” (protect disabled) is written into the ROM code protect address when Renesas Technology corp. performs writing. The writing of “0016" or “FF16 ” can be selected as ROM option setup (“MASK option ” written in the mask file converter) when or- dering. Fig. 8 Memory map diagram 010016 000016 004016 FF0016 FFDC16 FFFE16 FFFF16 XXXX16 20480 B00016 B08016 YYYY16 ZZZZ16 RAM ROM 1024 043F16 0FF016 0FFF16 SFR area Not used Interrupt vector area Reserved ROM area (Note) (128 bytes) Zero page Special page RAM area RAM size (bytes) Address XXXX16 Reserved ROM area (Note) ROM area ROM size (bytes) Address YYYY16 Address ZZZZ16 SFR area Notes: This area is reserved in the QzROM version. |
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